Die-head



W. H. GATES.

DIE HEAD.

APPLICATION FILED .IULY 26.19I9.

1,358,074. Patented Nov. 9, 1920. V 71391 fi TigqZ INVENTO I 1 ATTORNEYw. H. GATES.

DIE HEAD.

APPLICATION FILED JULY 26,1919.

1,358,074. Patented Nov. 9, 1920.

2 SHEETS-SHET 2.

I 11 ATTORNEY UNITED STATES WILLIAM H. GATES, OF NEW HAVEN, CONNECTICUT.

DIE-HEAD.

Application filed July 26, 1919.

To all whom it may concern:

Be it known that l, VILLIAM H. GATES, citizen of the United States,residing at New Haven, in the county of New Haven and State ofConnecticut, have invented certain new and useful Improvements in.l)ie-Heads; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it ap pertains to make and use the same.

My invention relates to thread cutting tools of the character known inthe trade as die heads, it being an improvement on the patent granted tome August'3, 1915, No. 1,18,510. One of the several improved features ofthe present construction consists in locating the cam, for actuating.the threading dies, in close proximity to the axis of the die head, thusgreatly reducing the size of the die head for cutting threads on smallscrews and work of like character.

Referring to the drawings wherein the same figures and letters ofreference indicate like parts throughout the several views;

Figure '1 represents a front elevation of the die head showing thethreading dies closed;

Fig. 2 is a front elevation of the die head showing the dies opened;

Fig. 3 is a side elevation of the die head showing the position of theseveral members when the dies are closed also broken view partly insection of two of the members- Fig. 4' is a broken view partly insection of the die head showing the trip lever depressed so as torelease the shell;

F i 5 is a detail plan view of the overhanging bracket and broken viewof its shank and shank of the die head;

Fig. 6 is a rear elevation of the die head and sectional view of theoverhanging bracket on line 6-6 of Fig. 3;

Fig. 7 is a front elevation of the shell and head carrying the dies withthe front plate, overhanging bracket, cam lever, and trip lever removed;

Fig. 8 is a detail view and rear elevation of the head adapted to carrythe threading dies- Fig. 9 is a front elevation and interior view of theshell, broken View of the cam lever extension and sectional view of theshank of the die carrying head;

Specification of Letters Patent.

Patented Nov. 9, 1920.

Serial No. 313,509.

Fig. 10 is a broken view of the die carrymg head and shell, showing thelatter in open position;

Fig. 11 is a central sectional view of the shell, die head and brokenView of the shank of the die head, on line 11--11 of Fig. 7

F 1g. 12 is a detail broken view of the cam lever;

Fig. 13 is a central sectional view of the die carrylng head and brokenview of its shank, central sectional view of the shell, cam lever, itshub and the plate located between the head and cam lever on line 13r-l3of Fig. 1;

Fig. 14 is a detail view of one of the threading dies; and

Fig. 15 is a broken sectional View of the cam lever, and broken view ofthe die head shank, showing the cam grooves located in the shank.

The head 1 is provided with the radial slots 2 to receive the threadingdies 3 and the shank at integral with the head 5 is a plate secured tothe front end of the head by the screws 6, Figs. 1 and 2, and '7, Fig.7, are threaded holes in the head for said screws. 8 is the dieactuating shell mounted on the periphery of the head 1. The four camstuds 9 are anchored to the shell and have a movement therewith and arealso movably supported in the holes 10, Fig. 8, formed in the head 1.

The threading dies are each provided with a cam groove similar to thegroove 11, Fig. 14, adapted to receive the cam projections 12 of thestuds 9 whereby the dies are radially actuated by the reciprocation ofthe shell 8.

13 is atrip lever pivotally supported in V the periphery of the shell 8and on the pin 14, Fig. 9. 15, Fig. 13, is a locking bolt located in thehole 16 of the head 1 and it extends through the hole 17, Fig. 9, of thevertical part of the shell 8. 18, Fig. 13, is a notch in the forward endof the bolt adapted to receive the tail piece 13 of the trip lever, and14, Fig. 9, is a spring to maintain the trip lever with said notch. 19is an adjusting screw adapted to adjust the notch with respect to theposition of said tail piece. 20 is a hole through the plate 21 inalinement with the bolt 15 to give it end clearance.

The mechanism for automatically advancing and locking the shell 8 to thehead 1 consists of the cam late or lever 22 having the hub 23 journa edon the shank 4 of the head. The central opening 24, Fig. 11, of theshell and a similar central opening in the plate 21-not shown-embracesthe hub 23, as shown in Fig. 13. The bore 25, Fi

The assembled die head is advanced- 12, through the cam lever isprovided wit the cam grooves 26-see also Figs 6 and 9-registering withthe outer surface of the shank 4 and adapted thereby to receive the in27 projecting through the shank 4 of the head 1seen also in Fig. 8.

The cam lever 22 is rotatably secured to the plate 21, Fig. 6, by meansof the screw 28, located in the slot 29, while the screws 30 secure thelate 21 to the shell 8. 31 is a stop pin/a" aptedto be engaged by theshoulder 32, Figs. 3 and 6, when the cam lever is rotatedto close thethreading dies, and to be engaged by the opposite shoulder 33 when thethreading dies are opened and the cam lever is inthe position shown inFig. 2. The stop pin 31 has a longitudinal movement in the hole 31, Fig.8, of the shell 8, and a similar hole-not shown-in the plate 21, and itis backed up by the spring 34 so that it can be depressed to permit afurther reverse rotary movement of the cam lever a distance sufficientto release the cam studs from the dies so that the dies can be removed.It is also depressed by the inner face of the cam lever 22 until saidcam lever is fully seated in its normal workable po sition against theface of the plate or ring 21, when the stop pin will snap into the re- 4cess 22 'Fig. 6, of the cam lever. In removing the cam lever, the pin 31will also be depressed to permit of a, reverse rotary movement of saidlever.

35 is a bracket overhanging the members 5, 8, 13' and 21 and has thehollow shank 36 adapted to be secured in a turret head or -other likecarrier--not shown-for actuating the tool to and from the work. Theshank 4 of the die head Fig. 3-has a sliding fit in the shank 36 and isoperatively retained therein by the pin 37 embraced by the elongatedslot 38. The threaded end of the screw 39 engages the threaded hole 40see also Fig. 8-and the die head relief spring 41 is located between theend of the shank 4 and the partition 42, while the spring 43 is locatedbetween the head 44 of the screw and said partition. The object andpurposes of these springs will be hereinafter more fully explained.

The overhang portion of the bracket 35 A carries the trip pin 45 whosethreaded end is engaged by the nut 46. 47-see also Fig.

5--1s an adjusting screw adapted to locatethe position of the trip pinwith respect to the trip lever 13.

48, Figs. 4 and 9, are springs located in the holes 49 projectingthrough the body of the shell 8 and resting against the inside face ofthe plate 21. 50, Fig. 8, are corresponding holes or-recesses in thehead 1 in which the opposite ends of the springs are located when thehead 1 and the sleeve are assembled. v

The operation of the device is as follows:

through the medium of the turret head, not shown-toward an article to bethreaded, and, during such advance, the extension 51 of the cam lever 22will engage with a proect1onnot shown-in line with the forward movementof the die head and cause the cam lever 22 to rotate toward thespring41, Fig. 3, will allow the die head to give back slightly until the dieshave taken hold in a proper manner. As soon as this takes place, the diehead, with its shank 4, Fig. 4, will be carried along by the threadingoperation, and, in doing so, compress-the spring 43, Fig. 3. Thethreadcutting will continue a predetermined distance due to the positionof the trip pin, 45, when said piirwill engage the trip lever 13; Figs.2 and 4, to release its engagement with the locking bolt, whereupon thesprings 48 will force the shell back into its normal open position shownin Fig. 10. This reverse movement of the shell will also reversethemovement of the cam lever v22 into its normal position shown in Fig. 2.

As soon as the shell is released, the stored to their normal positionsshown in Fig. 3.

While I show theplate 21 secured to the die head, and the cam leverrotatably connected to the plate, said plate could be dispensed with andthe cam lever rotatably connected to the head. 7 v

The cam grooves 26*, Fig. 15, could be located in the shank 4 of the diehead, and the in 27* in the cam lever if so desired.

aving thus described my invention, what I claim is 1. In combinationwith a die head carrying radially operating threading dies and a shellembracing the head carrying cam studs engaging the dies, said headhaving a shank, a cam lever having a bore provided studs engaging thedies, an adjustable locking bolt mounted in the head, a trip leverpivotally supported in the shell. said head having a shank, a cam leverrotatably carrying radially operating dies and an adjustable lockingbolt, a shell embracing the head carrying die actuating cam studs, atrip lever mounted in the shell adapted to engage with the bolt, saidhead having a shank, a cam lever rotatably mounted thereon and locatedin workable relation with the shell, said lever having internal camgrooves registering with the surface of the shank, means carried by theshank to register with the cam grooves, and a stop pin to limit therotative movement of the cam lever.

4. In a die head of the character described carrying radially operatingdies, an adjustable locking bolt within the head, a shell embracing thehead carrying die actuating cam studs, a trip lever mounted in theshell,

said head having a shank, a shell actuating cam lever rotatably mountedon the shank and having internal cam grooves registering therewith,means on said shank adapted to register with said cam grooves, a brackethaving a shank embracing the die head shank and in which said die headshank has a longitudinal movement under spring tension, and meanscarried by the bracket to engage the trip lever and release the shellfrom its locked engagement with the die head.

5. A die head having a shank integral therewith, a locking bolt, asliding shell embracing the head, a trip lever carried by the shell, abracket overlying the shell, adjustable tripping means carried by thebracket adapted to engage the trip lever and release the shell, saidbracket having a shank embracing the die head shank in which the diehead shank is adapted to have a longitudinal movement under springtension.

6. A die head carrying radially operating dies, an adjustable lockingbolt within the head, a sliding shell embracing the head and carryingdie actuating cam studs, a trip lever carried by the shell, said diehead having a shank, a cam lever rotatably mounted on said shank and inworkable relation with the shell and having internal cam groovesregistering with the shank, means on said shank registering with the camgrooves, an

overlying bracket, said bracket having a shank adapted to support thedie head and embracing the die head shank, a relief spring for the diehead located within the bracket shank, said cam lever having anextension adapted to be actuated to rotate said lever and advance theshell into locking engagement with the die head, means carried by thebracket to engage the trip lever and release the shell, and a springlocated within the bracket shank and under control of the die head shankadapted to store up tension during the threading operation and returnthe die head to its normal position after the shell is released.

7. A die head having a shank and carrying radially operating dies, ashell embracing the head carrying die actuating cam studs, a memberrotatably mounted on the shank in workable relation with the shell andhaving internal cam connection with the shank whereby the shell isactuated to close the dies.

In testimony whereof I affix my signature.

WILLIAM H. GATES.

